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<H2><A NAME="8_1">8.1 Line plots</A></H2>
<P> The first example draws a line graph consisting of 10 Y-values. In
 this first example we show the full code. In the following examples we
 will only show interesting piece of the code.<DIV class="phpscript">
(File: example0.php)
<BR><CODE><FONT color="#000000"> <FONT color="#0000BB">&lt;?php
<BR></FONT><FONT color="#007700">include&nbsp;(</FONT><FONT color="#DD0000">
&quot;../jpgraph.php&quot;</FONT><FONT color="#007700">);
<BR>include&nbsp;(</FONT><FONT color="#DD0000">&quot;../jpgraph_line.php&quot;</FONT><FONT
color="#007700">);
<BR>
<BR></FONT><FONT color="#FF8000">//&nbsp;Some&nbsp;data
<BR></FONT><FONT color="#0000BB">$ydata&nbsp;</FONT><FONT color="#007700">
=&nbsp;array(</FONT><FONT color="#0000BB">11</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">3</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
8</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">12</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">5</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">1</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">9</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
13</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">5</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">7</FONT><FONT color="#007700">
);
<BR>
<BR></FONT><FONT color="#FF8000">
//&nbsp;Create&nbsp;the&nbsp;graph.&nbsp;These&nbsp;two&nbsp;calls&nbsp;are&nbsp;always&nbsp;required
<BR></FONT><FONT color="#0000BB">$graph&nbsp;</FONT><FONT color="#007700">
=&nbsp;new&nbsp;</FONT><FONT color="#0000BB">Graph</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">350</FONT><FONT color="#007700">,</FONT><FONT color="#0000BB">
250</FONT><FONT color="#007700">,</FONT><FONT color="#DD0000">&quot;auto&quot;</FONT><FONT
color="#007700">);&nbsp;&nbsp;&nbsp;&nbsp;
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">SetScale</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;textlin&quot;</FONT><FONT color="#007700">);
<BR>
<BR></FONT><FONT color="#FF8000">//&nbsp;Create&nbsp;the&nbsp;linear&nbsp;plot
<BR></FONT><FONT color="#0000BB">$lineplot</FONT><FONT color="#007700">
=new&nbsp;</FONT><FONT color="#0000BB">LinePlot</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">$ydata</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$lineplot</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT color="#007700">(</FONT><FONT
color="#DD0000">&quot;blue&quot;</FONT><FONT color="#007700">);
<BR>
<BR></FONT><FONT color="#FF8000">//&nbsp;Add&nbsp;the&nbsp;plot&nbsp;to&nbsp;the&nbsp;graph
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">Add</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
$lineplot</FONT><FONT color="#007700">);
<BR>
<BR></FONT><FONT color="#FF8000">//&nbsp;Display&nbsp;the&nbsp;graph
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">Stroke</FONT><FONT color="#007700">();
<BR></FONT><FONT color="#0000BB">?&gt;
<BR></FONT></FONT></CODE></DIV><DIV class="example">
<BR> <A href="exframes/frame_example0.html" target="blank"><IMG border="0"
HEIGHT="250"  src="img/example0.png" WIDTH="350"></A>
<BR><B>Figure 3:</B> A simple line graph <A href="exframes/frame_example0.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
<P> You might note a few things</P>
<UL>
<LI>Both the X and Y axis have been automatically scaled. We will later
 on show how you might control the auto scaling how it determines the
 number of ticks which is displayed.</LI>
<LI>By default the Y-grid is displayed in a &quot;soft&quot; color</LI>
<LI>By default the image is bordered and the margins are slightly gray.</LI>
<LI>By default the 0 label on the Y-axis is not displayed</LI>
</UL>
<P> This is a perfect fine graph but looks a little bit &quot;sparse&quot;. To
 make it more interesting we might want to add a few things like</P>
<UL>
<LI>A title for the graph</LI>
<LI> Title for the axis</LI>
<LI>Increase the margins to account for the title of the axis</LI>
</UL>
<P> From looking at the previous example you can see that you access all
 properties of JpGraph through the objects you create. Graph(),
 LinePlot() and so on. In general all objects you can see in the graph
 is accessed through a named instance.</P>
<P> For example the title of the graph is accessed through the
 'Graph::title' property. So to specify a title string you make a call
 to the 'Set()' method on the title property as in:</P>
<P><DIV class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">title</FONT><FONT
color="#007700">-&gt;</FONT><FONT color="#0000BB">Set</FONT><FONT color="#007700">
(</FONT><FONT color="#DD0000">'Example&nbsp;2'</FONT><FONT color="#007700">);</FONT><FONT
color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P> So by adding just a few more lines to the previous code we get a
 graph as shown below.<DIV class="example">
<BR> <A href="exframes/frame_example2.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/example2.png" WIDTH="300"></A>
<BR><B>Figure 4:</B> Same basic graph as in previous figure but with a
 titles for graph and axis. <A href="exframes/frame_example2.html" target="blank">
[src]</A>&nbsp;
<P></P>
</DIV></P>
<P>To achieve this we just needed to add a few more lines. (We only show
 the part of example 1 we changed, to look at the full source just click
 the [src] link in the caption. )<DIV class="phpscript"><CODE><FONT color="#000000">
 <FONT color="#0000BB">&nbsp;</FONT><FONT color="#FF8000">
//&nbsp;Setup&nbsp;margin&nbsp;and&nbsp;titles
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">img</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
SetMargin</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">40</FONT><FONT
color="#007700">,</FONT><FONT color="#0000BB">20</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">20</FONT><FONT color="#007700">,</FONT><FONT
color="#0000BB">40</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
Set</FONT><FONT color="#007700">(</FONT><FONT color="#DD0000">
&quot;Example&nbsp;2&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">xaxis</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">Set</FONT><FONT
color="#007700">(</FONT><FONT color="#DD0000">&quot;X-title&quot;</FONT><FONT color="#007700">
);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">yaxis</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">Set</FONT><FONT
color="#007700">(</FONT><FONT color="#DD0000">&quot;Y-title&quot;</FONT><FONT color="#007700">
);
<BR></FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P></P>
<P> Again there are a couple of things you should note here</P>
<UL>
<LI>A default font and size is used for the text</LI>
<LI>The default position for the title of the graph is to be centered at
 the top</LI>
<LI>The default position for the title of the x-axis is the far right
 and for the y-axis centered and rotated in a 900 angle.</LI>
</UL>
<P></P>
<P> A nice change would now be to have all the titles in a bold font and
 the line plot a little bit thicker and in blue color. Let's do that by
 adding the lines<DIV class="phpscript"><CODE><FONT color="#000000"> <FONT
color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">SetFont</FONT><FONT
color="#007700">(</FONT><FONT color="#0000BB">FF_FONT1</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">FS_BOLD</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">yaxis</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">SetFont</FONT><FONT
color="#007700">(</FONT><FONT color="#0000BB">FF_FONT1</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">FS_BOLD</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">xaxis</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">
title</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">SetFont</FONT><FONT
color="#007700">(</FONT><FONT color="#0000BB">FF_FONT1</FONT><FONT color="#007700">
,</FONT><FONT color="#0000BB">FS_BOLD</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$lineplot</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT color="#007700">(</FONT><FONT
color="#DD0000">&quot;blue&quot;</FONT><FONT color="#007700">);
<BR></FONT><FONT color="#0000BB">$lineplot</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetWeight</FONT><FONT color="#007700">(</FONT><FONT
color="#0000BB">2</FONT><FONT color="#007700">);&nbsp;&nbsp;</FONT><FONT color="#FF8000">
//&nbsp;Two&nbsp;pixel&nbsp;wide</FONT><FONT color="#0000BB"></FONT></FONT></CODE></DIV>
</P>
<P> Again please note the consistent interface. To change font you just
 have to invoke the SetFont() method on the appropriate object. This
 principle is true for most methods you will learn. The methods may be
 applied to a variety of objects in JpGraph. So for example it might not
 come as a big surprise that to have the Y-axis in red you have to say:<DIV
class="phpscript"><CODE><FONT color="#000000"> <FONT color="#0000BB">
&nbsp;$graph</FONT><FONT color="#007700">-&gt;</FONT><FONT color="#0000BB">yaxis</FONT><FONT
color="#007700">-&gt;</FONT><FONT color="#0000BB">SetColor</FONT><FONT color="#007700">
(</FONT><FONT color="#DD0000">&quot;red&quot;</FONT><FONT color="#007700">)</FONT><FONT
color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P> or perhaps we also want to make the Y-axis a bit wider by<DIV class="phpscript">
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">yaxis</FONT><FONT color="#007700">-&gt;</FONT><FONT
color="#0000BB">SetWidth</FONT><FONT color="#007700">(</FONT><FONT color="#0000BB">
2</FONT><FONT color="#007700">)</FONT><FONT color="#0000BB"></FONT></FONT>
</CODE></DIV></P>
<P> As a final touch let's add a frame and a drop shadow around the
 image since this is by default turned off. This is done with<DIV class="phpscript">
<CODE><FONT color="#000000"> <FONT color="#0000BB">&nbsp;$graph</FONT><FONT color="#007700">
-&gt;</FONT><FONT color="#0000BB">SetShadow</FONT><FONT color="#007700">()</FONT><FONT
color="#0000BB"></FONT></FONT></CODE></DIV></P>
<P> The result of all these modifications are shown below.<DIV class="example">
<BR> <A href="exframes/frame_example3.html" target="blank"><IMG border="0"
HEIGHT="200"  src="img/example3.png" WIDTH="300"></A>
<BR><B>Figure 5:</B> Making the image a little bit more interesting by
 adding som colors and changing the fonts <A href="exframes/frame_example3.html"
target="blank">[src]</A>&nbsp;
<P></P>
</DIV></P>
<P></P>
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